原创 CRC16

crc16.h

#ifndef _CRC16_H_

#define _CRC16_H_

unsigned short crc16_ccitt(const char *buf, int len);

#endif

crc16.c

#include "crc16.h"

0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,


 0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,


 0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,0x72f7,0x62d6,


 0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de,


 0x2462,0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485,


 0xa56a,0xb54b,0x8528,0x9509,0xe5ee,0xf5cf,0xc5ac,0xd58d,


 0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,0x46b4,


 0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc,


 0x48c4,0x58e5,0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823,


 0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,0x9969,0xa90a,0xb92b,


 0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12,


 0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a,


 0x6ca6,0x7c87,0x4ce4,0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41,


 0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,0x8d68,0x9d49,


 0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70,


 0xff9f,0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78,


 0x9188,0x81a9,0xb1ca,0xa1eb,0xd10c,0xc12d,0xf14e,0xe16f,


 0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,0x6067,


 0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e,


 0x02b1,0x1290,0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256,


 0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,0xe54f,0xd52c,0xc50d,


 0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405,


 0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c,


 0x26d3,0x36f2,0x0691,0x16b0,0x6657,0x7676,0x4615,0x5634,


 0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,0xb98a,0xa9ab,


 0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3,


 0xcb7d,0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a,


 0x4a75,0x5a54,0x6a37,0x7a16,0x0af1,0x1ad0,0x2ab3,0x3a92,


 0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,0x8dc9,


 0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1,


 0xef1f,0xff3e,0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8,


 0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,0x3eb2,0x0ed1,0x1ef0


};

 

unsigned short crc16_ccitt(const char *buf, int len)

{

 register int counter;

 register unsigned short crc = 0;

 for( counter = 0; counter < len;
counter++)

  crc =
(crc<<8) ^
crc16tab[((crc>>8) ^ *(char
*)buf++)&0x00FF];

 return crc;

}